US1638266A - kindl - Google Patents

Description

Aug. 9. 1927.

' 1,638,266 C. H. KINDL IGNITION SYSTEM Filed Dec. '7. 1925 4 mm M Patented Aug. 9, 1927.

UNITED STATES PATENT OFFICE;

CARL I-I. KINDL, OF ANDERSON, INDIANA, ASSIGNOR, BY MESNE'ASSIGNMENTST TO DELCO-REMY CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

IGNITION SYSTEM.

Application filed December 7, 1925. Serial No. 73,716.

This invention relates to ignition appara tus for interntil-combustion engines and particularly for high-speed engines having a large number of cylinders and, therefore, re-,

quiring sparking impulses to be provided in rapid succession.

More particularly, the present invention relates to the type of ignition apparatus disclosed in a patentto J. H. Hunt, No. 1,557; 201, issued October 13, 1925. This patent discloses an ignition coil havinga secondary coil and two primary coils which are inductively related. The ignition timing, mechanism operates first to connect a current source with one of the primary coils having a relatively low inductance. Current builds up rapidly in this primary coil in order to produce the required magneto-motive force, following which both primary coils are connected in series with the current source in order to reduce the amount of current to be carried by the timer contacts at the time of break ofthe primary ignition circuit while maintaining the required magneto-motive force. I

One of the objects of the present invention is to produce satisfactory ignition with apparatus which is less expensive to construct than that disclosed in the Hunt patent referred to. As in the Hunt patent the present invention provides for the rapid accumulation of magneto-motive force and for the reduction of primary current at the time of final break of the primary circuit so that the current carried by the timer contacts at the time of separation will be within safe limits.

In order to accomplish these results by apparatus which can be constructed at lower cost than the Hunt apparatus, the present invention provides an ignition coil including primary and secondary windings and an auxiliary coil of relatively low inductance, non-inductively related to the main ignition coil. The ignition timer is so constructed that the auxiliary coil only is connected with the current source in order that it will be quickly energized. Then the auxiliary coil is connected in series with the primary of the main ignition coil and the current source in order that the energy stored in the auxiliary coil will be dischargedinto the primary circuit of the ignition coil in order to boost the current in the ignition primary to a higher value than could be reached in the samelength of time if the auxiliary coil were not used. At the time of separation of the timer cont-acts to interrupt the flow of current to the main ignition coil, the primary current has been reduced to a value which -the contacts can withstand without rapid deterioration. Since the auxiliary coil is non-inductively related to the main ignition coil, the secondary of the main ignition coll may have fewer turns than the secondary of the Hunt ignition apparatus.

One of the objects of the present invention is to provide an improved form of in duction apparatus which can be charged rapidly with a magneto-motive force sufficient for providing a sparking impulse.

The ignition system includes induction apparatus comprising two primary inductive circuits connected with the battery,.orother source of current, by a suitable enginedriven timing apparatus. A secondary winding is inductively related to only one of the primary inductive circuits and is connected with a distributor. The primary inductive circuit, having no secondary winding, is energized before energizing the other primary inductive circuit; and,before said other circuit is d ischarged, the energy offthe first primary circuit is discharged into the second primary circuit in order to boost the current in said second circuit to a higher value than could be reached in the same length of time if the first primary circuit were not used.

Further objects and advantages of the present invention will be apparent from the following description. reference being had to the accompanying, drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings: v

Fig. 1 is a wiring diagram illustrating the present invention.

F i 's. 2 and 3 are diagrammatic views showlng developments of the timer cams which are shown in Fig. 1.

Referring to Fig. 1, designates a storage battery grounded at 21 and connected by switch 22 with a first primary inductive circuit 23 which is connected by a wire 24 with a second primary inductive circuit 25. l/Vinding 25 is inductively related to a secondary winding 26 having one end grounded on the primary circuit and the other end connected by wire 27 with a distributor 28, for distributing sparking impulses to various spark plugs, represented by the spark gaps 29. The wire 24: is connected by wire with ignition timer contacts 31and 32, the latter being mounted on abreaker lever which is intermittently operated by an engine-driven cam 34. The breaker lever is grounded at 35 to complete the primary circuit to the battery. The winding 25 is connected by wire with contacts 37 and 38, the latter being mounted on breaker lever 39 which is intermittently operated by an engine-driven cam 10. Springs 41 yieldingly urge the breaker levers toward their respective cams, so that the pairs of contacts will remain in engagement until the rubbing blocks 4:2 01 the levers are engaged by the lobes of the cams.

The cams 34; and rotate in the same direction and at the same rate,the direction being clockwise in Fig. 1, or in the direction of the arrows 45 in Figs. 2 and 3.

The operation of the invention is as follows: r I I Contacts 31 and 32 are closedwhile the contacts 37 and 38 are open. This causes current to flow from the battery only through the first inductive circuit This circuit is relatively low in inductance, so that a relative large amount of magnetometive force will be stored in the circuit Within a relatively brief period. Then, after contacts 37 and 38close, contacts 31 and '32 are opened, in order that the energy produced'in circuit 23 will be discharged into the circuit'25, so that before. circuit 25 is discharged the current passing therethrough will reach a higher value'than would be pos sible if the circuit 23 were not used.

While the form of embodiment of the in vention as herein disclosed, constitutes a pre ferred form, it is to be understood thatother forms might be adopted, all coming within the scope of the claims which 011O7.'

lVhat is claimed is as follows:

1. An ignition system comprising an 'ig nition coil having a primary and a second ary inductively related, an auxiliary coil non-inductively related to the ignition coil, a source ci -current, and means for connecting the auxiliary coil only with the current source, then for connecting theauxiliary coil and primary .winding oi" the ignition coil in series with the current. source without disconnecting the auxiliary coil, and then for disconnecting both coils from the current source.

2. An ignition system as defined by claim' '1 in which the riinar windin oi the ignition coil and the auxiliary coil have relatively low inductance.

In testimony whereof I hereto afiix'iny signature.

' CARL H. KINDL.

Therefore satisfactory ignition can i

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